jsonpath-exists-semantics-fix-wip.patch

diff --git a/src/backend/utils/adt/jsonpath_exec.c b/src/backend/utils/adt/jsonpath_exec.c
index ac16f5c85d..63c46cfab5 100644
--- a/src/backend/utils/adt/jsonpath_exec.c
+++ b/src/backend/utils/adt/jsonpath_exec.c
@@ -2065,7 +2065,14 @@ appendBoolResult(JsonPathExecContext *cxt, JsonPathItem *jsp,
 	JsonbValue	jbv;
 
 	if (!jspGetNext(jsp, &next) && !found)
-		return jperOk;			/* found singleton boolean value */
+	{
+		/*
+		 * We have a predicate check expression, i.e. a path ending in a bare
+		 * boolean operator, and we don't need to return the exact value(s)
+		 * found.  Just report success or failure of the boolean.
+		 */
+		return (res == jpbTrue) ? jperOk : jperNotFound;
+	}
 
 	if (res == jpbUnknown)
 	{
diff --git a/src/test/regress/expected/jsonb_jsonpath.out b/src/test/regress/expected/jsonb_jsonpath.out
index 6659bc9091..59e1b71051 100644
--- a/src/test/regress/expected/jsonb_jsonpath.out
+++ b/src/test/regress/expected/jsonb_jsonpath.out
@@ -1157,7 +1157,7 @@ select jsonb_path_query('2', '$ == "2"');
 select jsonb '2' @? '$ == "2"';
  ?column? 
 ----------
- t
+ f
 (1 row)
 
 select jsonb '2' @@ '$ > 1';